The victim was hit in the leg, Assistant Commissioner J. Peter Donald tweeted. Police are searching for one gunman.

The victim, a 50-year-old man from Queens, was hit in the ankle and is expected to recover, officials said.

The NYPD said that 911 calls just after 2:30 p.m. indicated that an argument preceded the gunfire, but that it is not yet clear if the victim was the intended target.

Authorities released security camera video showing the gunman opening fire at the corner of Atlantic Avenue and Flatbush Avenue, in front of the Atlantic shopping mall. The video shows the man walking backwards while gesturing at someone. Then it shows him pulling out a handgun and running back the way he came and fire several shots off-screen. Police describe the suspect as black with a thin build and last seen wearing a blue baseball hat, a black shirt, and dark-colored pants with a white stripe down the side.

If you recognize the man or have any information, you can contact the Crime Stoppers at 800-577-TIPS (8477) for English or 888-57-PISTA (74782) for Spanish or at www.nypdcrimestoppers.com or by texting tips to 274637 (CRIMES) then entering TIP577.

Barclays Center is home to the Brooklyn Nets and New York Islanders. It also hosts concerts and other events.

With the AP

Extensive crime scene. Witnesses ran after they heard shots-- between 3 and 4 gunshots total